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This paper presented an experimental investigation on the pressure drop during flow boiling of liquefied natural gas in a vertical micro-fin tube. The effect of heat flux, mass flux and inlet pressure on the frictional pressure drop during two-phase flow of liquefied natural gas was analyzed. Results showed that the two-phase flow pressure drop increased with the increasing of heat flux and mass flux but decreased with the increasing of inlet pressure. The calculated results with Miyara correlation, Oliver correlation, Hu correlation and Goto correlation showed that the Hu correlation could give the best prediction which also has a big error. Thence a new correlation was developed based on the experimental data. [ABSTRACT FROM AUTHOR]

Two-phase pressure drop of LNG (liquefied natural gas) during flow boiling has been measured in a horizontal smooth tube with an inner diameter of 8 mm at 0.3-0.7 MPa. And the experiments was conducted with the mass flux of 50-200 kg m-2 s-1, heat flux of 8-32 kW m-2, and vapor quality of 0.16-0.83. The effects of vapor quality, heat flux and mass flux, inlet pressure on the frictional pressure drop of LNG are discussed. The comparisons of the experimental data with the predicted value by existing six correlations are analyzed. Müller-Steinhagen and Heck [8] and Friedel [21] can provide acceptable predictions for two-phase pressure drop of LNG at inlet pressure of 0.3-0.7 MPa among them. [ABSTRACT FROM AUTHOR]